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4 failed Guided Lactate Threshold Tests

I have attempted four guided lactates threshold runs with each time progressing through all the stages for it only to tell me lactate threshold not detected. I’m absolutely stumped as to what is going on..

In talking with some other users we thought maybe my HRM 3 SS heart rate monitor may have been the issue so recently I went and bought a HRM Dual monitor. I went to test this yesterday, and it still failed to detect my lactate threshold. Can anyone give some guidance as to what might be going on here please?

these results were from my latest guided test yesterday:

0 1587148 over 1 year ago

Out of curiosity what is your Max HR set to in your profile, how was it calculated? I wonder if your Max HR is set too high, the test might be viewed as a sub maximal and therefore unable to carry out the calculation. Although LTHR isn’t itself at maximal effort I would guess the calculation might need something close to put your effort into context.